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Experimental results from the Stanford Linear Accelerator Center were published showing that protons were composed of smaller particles, the first evidence of quarks.
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SLAC National Accelerator Laboratory
Research center at Stanford University
SLAC National Accelerator Laboratory, originally named the Stanford Linear Accelerator Center, is a federally funded research and development center in Menlo Park, California, United States. Founded in 1962, the laboratory is now sponsored by the United States Department of…Source: Wikipedia (CC BY-SA)
Proton
Subatomic particle with positive charge
A proton is a stable subatomic particle, symbol p, H+, or 1H+ with a positive electric charge of +1 e (elementary charge). Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio). Protons and…Source: Wikipedia (CC BY-SA)
Quark
Elementary particle, main constituent of matter
A quark is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. All commonly observable matter is composed of up…Source: Wikipedia (CC BY-SA)